/*
 * Copyright (C) 2009 Leandro Aparecido <lehphyro@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.metalframework.jsf.converter;

import javax.faces.component.*;
import javax.faces.context.*;
import javax.faces.convert.*;

/**
 * Enum converter based on toString() to convert values.
 * 
 * @since 1.0
 */
public class ToStringBasedEnumConverter implements Converter {

	@SuppressWarnings("unchecked")
	public Object getAsObject(FacesContext context, UIComponent component, String value) throws ConverterException {
		Class<? extends Enum<?>> enumType = component.getValueExpression("value").getType(context.getELContext());

		for (Enum<?> e : enumType.getEnumConstants()) {
			if (e.toString().equals(value)) {
				return e;
			}
		}
		
		return null;
	}

	public String getAsString(FacesContext context, UIComponent component, Object value) throws ConverterException {
		if (value == null) {
			return null;
		}
		
		if (value instanceof Enum<?>) {
			return ((Enum<?>)value).toString();
		}
		
		return (String)value;
	}

}
